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Thread: Carb + Timing Issues

  1. #1
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    Default Carb + Timing Issues

    Hey guys, Courtney here. I haven't posted since my last update on getting my orange Pumpkin Z home. Everything was great, until seemingly overnight, the car started to give me problems again... Last time I messed with it and fixed it, I had adjusted the timing to further advance it, and that seemed to fix the issue. After a fresh rebuild on the dual Webers, I thought for sure that I would have a good chance at getting the setup to work.

    Now I'm finding that it's not that simple. I took the car out around town the other day, and it started bogging. I now can't drive it over 2k rpms, because it bogs that badly, and honestly, it's a little scary. It even backfired from the carbs once, which was an issue we had before, but thought we had fixed when we adjusted the timing. (The timing is currently fully advanced.) At this point, I'm looking for any advice I can get. I've been told that dual Webers on Z cars can be the most difficult setup, and that running the stock SU carbs is the best way to go. But I've also heard that if you dial in your Webers correctly, they can be great. I'm really conflicted, and since I have no history on these carbs other than the fact that I rebuilt them, I'm not sure what to do. Ideally I would like to keep them, but I won't be able to decide until this mystery issue is fixed. If any of you know 510s, you probably know who Troy Ermish is. I'm thinking that I might just take the car to him, since he's local and builds race 510s running dual Webers all day long.

    Any advice or ideas would be appreciated! Thanks guys.

  2. #2
    Registered User LeonV's Avatar
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    Default

    Dual Weber DGV carbs are inferior to the original SUs. Now DCOEs (what Ermish is likely familiar with) are a different story. If I were you, I'd track down a set of round top SUs, or triple Weber DCOEs if you're feeling adventurous.

    *Shameless plug*

    FWIW, I'm the EFI/Carb tuner at WORKS Motorsports in Sonoma. If you're nearby, you can consider bringing the Z here for any work you need. I've been playing with Zs for over 7 years.
    2/74 260Z

  3. #3
    Registered User siteunseen's Avatar
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    Mine had about a pound of rusty crud in the gas tank. Check your filters.
    1972 240Z #918 New Sight Orange
    1977 280Z #305 Light Blue Metallic
    1972 240Z #110 Persimmons Red

  4. #4
    Registered User madkaw's Avatar
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    SHAMELESS! If I were you I would take it to Leon. To have a Z expert in your backyard is priceless. There are many on this site that would love to have that advantage. It will save you time and money and you can enjoy your Z sooner by figuring things out early.





    Quote Originally Posted by LeonV View Post
    Dual Weber DGV carbs are inferior to the original SUs. Now DCOEs (what Ermish is likely familiar with) are a different story. If I were you, I'd track down a set of round top SUs, or triple Weber DCOEs if you're feeling adventurous.

    *Shameless plug*

    FWIW, I'm the EFI/Carb tuner at WORKS Motorsports in Sonoma. If you're nearby, you can consider bringing the Z here for any work you need. I've been playing with Zs for over 7 years.
    LeonV likes this.
    Steve
    71 240z,bw-5sp 2.4-40 over,balanced,e-88,big valves,ported&polished, stage2,header, triple Mikuni's 40's
    3.90 Subaru STI LSD

  5. #5
    Registered User 2sixTZombii's Avatar
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    When I started on my the biggest issue was the weber dgvs I rebuilt them both twice and tried everything to make it run right, I couldn't figure out a single thing wrong with them, in the end I decided they were likely possessed by the devil and replaced them with a different set of DGVs which run great, these ones were easy to dial in too. So there not bad carbs just by being DGVs, but there seems to be a point when they are not worth messing with anymore, and DGVs seem especially prone to demonic possepossession. I wouldn't waste too much time fighting with them, if you think there the issue.
    1974 early 260z, Weber DGVs killed my motor.....

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